1616730257 has 4 divisors (see below), whose sum is σ = 1616866596. Its totient is φ = 1616593920.

The previous prime is 1616730233. The next prime is 1616730289. The reversal of 1616730257 is 7520376161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1094881921 + 521848336 = 33089^2 + 22844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616730257 - 2⁸ = 1616730001 is a prime.

It is a super-2 number, since 2×1616730257² = 5227633447798572098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1616730257.

It is not an unprimeable number, because it can be changed into a prime (1616730217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48488 + ... + 74729.

It is an arithmetic number, because the mean of its divisors is an integer number (404216649).

Almost surely, 2^1616730257 is an apocalyptic number.

It is an amenable number.

1616730257 is a deficient number, since it is larger than the sum of its proper divisors (136339).

1616730257 is a wasteful number, since it uses less digits than its factorization.

1616730257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136338.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 1616730257 is about 40208.5843695100. The cubic root of 1616730257 is about 1173.6695989670.

The spelling of 1616730257 in words is "one billion, six hundred sixteen million, seven hundred thirty thousand, two hundred fifty-seven".